<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="jquery/jquery-3.1.1.min.js"></script>
    <script type="text/javascript" src="js/load.js"></script>
</head>
<body>
    <h3 id="test">请点击下面的按钮,通过jQuery AJAX 改变这段文本</h3>
    <button id="btn1" type="button">获得外部的内容</button>
</body>
</html>